[PyQt] Selection dissapears when deselecting the delegate

[enter]

Hi,

I have a problem with my QComboBox delegate. The selection of the ComboBox dissapears when I deselect the delegate. I pasted the delegate code below. Did I forget to overload a QItemDelegate method ?

I heard about an openPersistantEditor method but I don't know where to put it in my code.

What am I missing ?

Thanks for your help.

class ComboBoxDelegate(QItemDelegate):
    def __init__(self, owner, itemslist):
        QItemDelegate.__init__(self, owner)
        self.itemslist = itemslist
 
    def paint(self, painter, option, index):		
        # Check if we're on top level of tree
        leftmostSibling = index.sibling(index.row(), 0)
        if leftmostSibling.parent().isValid():
            # We're not on top level of tree
            value = index.data(Qt.DisplayRole)
            print("paint" + value)
 
            # Fill style options with item data
            style = QApplication.style()
            opt = QStyleOptionComboBox()
            opt.currentText = self.itemslist.stringList()[0]
            opt.rect = option.rect
 
            # Draw item data as ComboBox
            style.drawComplexControl(QStyle.CC_ComboBox, opt, painter)
 
    def createEditor(self, parent, option, index):
        # Check if we're on top level of tree
        leftmostSibling = index.sibling(index.row(), 0)
        if leftmostSibling.parent().isValid():
            # We're not on top level of tree
            value = index.data(Qt.DisplayRole)
            # create the QStyleOptionComboBoxBox as our editor.
            editor = QComboBox(parent)
            editor.setModel(self.itemslist)
            if value == int:
                editor.setCurrentIndex(value)
            editor.installEventFilter(self)			
            return editor
 
    def setEditorData(self, editor, index):
        value = index.data(Qt.DisplayRole)
        editor.setCurrentIndex(value)
 
    def setModelData(self, editor, model, index):
        value = editor.currentIndex()
        model.setData(index, QVariant(value))
 
    def updateEditorGeometry(self, editor, option, index):
        editor.setGeometry(option.rect)
 
    def sizeHint(self, option, index):
        # Overload sizeHint method so that the QComboBox isn't shrinked 
        # by the QTreeView row height
        index_data = index.data(Qt.SizeHintRole)
        if index_data is None:
            return QSize(20, 20)

class ComboBoxDelegate(QItemDelegate):
    def __init__(self, owner, itemslist):
        QItemDelegate.__init__(self, owner)
        self.itemslist = itemslist
        
    def paint(self, painter, option, index):		
        # Check if we're on top level of tree
        leftmostSibling = index.sibling(index.row(), 0)
        if leftmostSibling.parent().isValid():
            # We're not on top level of tree
            value = index.data(Qt.DisplayRole)
            print("paint" + value)

            # Fill style options with item data
            style = QApplication.style()
            opt = QStyleOptionComboBox()
            opt.currentText = self.itemslist.stringList()[0]
            opt.rect = option.rect
 
            # Draw item data as ComboBox
            style.drawComplexControl(QStyle.CC_ComboBox, opt, painter)
 
    def createEditor(self, parent, option, index):
        # Check if we're on top level of tree
        leftmostSibling = index.sibling(index.row(), 0)
        if leftmostSibling.parent().isValid():
            # We're not on top level of tree
            value = index.data(Qt.DisplayRole)
            # create the QStyleOptionComboBoxBox as our editor.
            editor = QComboBox(parent)
            editor.setModel(self.itemslist)
            if value == int:
                editor.setCurrentIndex(value)
            editor.installEventFilter(self)			
            return editor
 
    def setEditorData(self, editor, index):
        value = index.data(Qt.DisplayRole)
        editor.setCurrentIndex(value)
 
    def setModelData(self, editor, model, index):
        value = editor.currentIndex()
        model.setData(index, QVariant(value))
 
    def updateEditorGeometry(self, editor, option, index):
        editor.setGeometry(option.rect)

    def sizeHint(self, option, index):
        # Overload sizeHint method so that the QComboBox isn't shrinked 
        # by the QTreeView row height
        index_data = index.data(Qt.SizeHintRole)
        if index_data is None:
            return QSize(20, 20)

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[enter]

To be more specific, when I change the index of the ComboBox it shows the index label until I deselect the ComboBox. Then there is no label.

[enter]

OK i finally found the solution : I needed to call the drawText method in paint.

def paint(self, painter, option, index):		
    # Check if we're on top level of tree
    leftmostSibling = index.sibling(index.row(), 0)
    if leftmostSibling.parent().isValid():
        # We're not on top level of tree
        value = index.data(Qt.DisplayRole)
        print(value)
 
        # Fill style options with item data
        style = QApplication.style()
        opt = QStyleOptionComboBox()
        #opt.currentText = str(self.itemslist.stringList[0])
        opt.rect = option.rect
 
        # Draw item data as ComboBox
        style.drawComplexControl(QStyle.CC_ComboBox, opt, painter)
        painter.drawText(option.rect, Qt.AlignVCenter, str(value))

def paint(self, painter, option, index):		
    # Check if we're on top level of tree
    leftmostSibling = index.sibling(index.row(), 0)
    if leftmostSibling.parent().isValid():
        # We're not on top level of tree
        value = index.data(Qt.DisplayRole)
        print(value)

        # Fill style options with item data
        style = QApplication.style()
        opt = QStyleOptionComboBox()
        #opt.currentText = str(self.itemslist.stringList[0])
        opt.rect = option.rect
 
        # Draw item data as ComboBox
        style.drawComplexControl(QStyle.CC_ComboBox, opt, painter)
        painter.drawText(option.rect, Qt.AlignVCenter, str(value))

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[lukeQt]

Thank you!!! You saved me time.